Carbon additives (Calcined Anthracite, made of super quality anthracite coal) SPECS: FC: 90% 92% 93% 95% min (various degree) Sulfur: 0.3% max Size: 1-5mm, 1-8mm, 10-30mm, 90% min or as requested Packing: in about 1Mt bag or 25kg PP bags into about 1Mt bag or as requested